Enablers for input methods on Android

Adding QInputMethod::inputItemRectangle()/setInputItemRectangle().

Known bugs: inputItemRectangle() not implemented for graphics view
items; inputItemTransform() implementation was already missing.

Change-Id: I72b1d43350e93858a2b374de3f2199500a96dc79
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/gui/kernel/qinputmethod.cpp

@@ -99,6 +99,33 @@ void QInputMethod::setInputItemTransform(const QTransform &transform)
     emit cursorRectangleChanged();
 }
 
+
+/*!
+    \since 5.1
+
+    Returns the input item's geometry in input item coordinates.
+
+    \sa setInputItemRectangle()
+*/
+QRectF QInputMethod::inputItemRectangle() const
+{
+    Q_D(const QInputMethod);
+    return d->inputRectangle;
+}
+
+/*!
+    \since 5.1
+
+    Sets the input item's geometry to be \a rect, in input item coordinates.
+    This needs to be updated by the focused window like QQuickCanvas whenever
+    item is moved inside the scene, or focus is changed.
+*/
+void QInputMethod::setInputItemRectangle(const QRectF &rect)
+{
+    Q_D(QInputMethod);
+    d->inputRectangle = rect;
+}
+
 /*!
     \property QInputMethod::cursorRectangle
     \brief Input item's cursor rectangle in window coordinates.

src/gui/kernel/qinputmethod.h

@@ -67,6 +67,9 @@ public:
     QTransform inputItemTransform() const;
     void setInputItemTransform(const QTransform &transform);
 
+    QRectF inputItemRectangle() const;
+    void setInputItemRectangle(const QRectF &rect);
+
     // in window coordinates
     QRectF cursorRectangle() const; // ### what if we have rotations for the item?
 

src/gui/kernel/qinputmethod_p.h

@@ -84,6 +84,7 @@ public:
     bool objectAcceptsInputMethod(QObject *object);
 
     QTransform inputItemTransform;
+    QRectF inputRectangle;
     QPlatformInputContext *testContext;
 };
 

src/widgets/kernel/qwidget.cpp

@@ -354,6 +354,7 @@ void QWidgetPrivate::updateWidgetTransform()
         QPoint p = q->mapTo(q->topLevelWidget(), QPoint(0,0));
         t.translate(p.x(), p.y());
         qApp->inputMethod()->setInputItemTransform(t);
+        qApp->inputMethod()->setInputItemRectangle(q->rect());
     }
 }